<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Cycle BG</title>
    <style>
        .header {
            margin: 0 auto;
            width: 400px;
            height: 200px;
            /*background-color: #3e8e41;*/

            display: flex;
            justify-content: center;
        }

        .header-cycle {
            width: 600px;
            height: 600px;
            background-color: lightblue;
            border-radius: 50%;

            position: absolute;
            top: -60%;
        }
    </style>
</head>
<body>

<div class="header">
    <div class="header-cycle"></div>
</div>

</body>
</html>
